Bastl 1983 Manuel utilisateur
1983
1983
Introduction
The 1983 translates MIDI information into analog CV and
GATE signals. Since the MIDI protocol defines notes of
absolute pitch, translating MIDI into Volt per Octave
standard is tricky because the base pitch of the oscillator
under control would always oset the tone. The 1983 is
capable of listening to simple waveforms of oscillators
(triangle, pulse, sine or saw) to read their frequency and
adjust the base pitch to make the oscillators play the
correct note of the pitch defined by the MIDI note. The
1983 does that for all available 7 octaves to ensure precise
tuning. Because several tuning systems might be used in
music (equal temperament, just intonation, concert A =
432Hz, etc.), the 1983 oers a µTune feature to adjust the
pitch of every semitone as desired. This can have a huge
impact on the sound in polyphonic and paraphonic
patches as you can set mathematical ratios of tones so
that they can interact with harmonics or other tones.
The 1983 has 4 channels of CV and GATE and these
Outputs can be configured into several dierent
LAYOUTS:
■4-VOICE POLYPHONY
■3-VOICE POLYPHONY + 1-VOICE MONOPHONY
■2 MONOPHONIC VOICES WITH VELOCITY
■1 COMPLEX MONOPHONIC VOICE
■4 MONOPHONIC VOICES
■8 GATES
■4 GATES WITH VELOCITY
■8 CC CHANNELS
■4-CHANNEL QUANTIZER
Each of these LAYOUTS has a LEARN mode to help you
set up a MIDI Channel, MIDI Note or MIDI CC Control
Change (continuous controller, such as a mod wheel) to
respond to. All of this can also be set manually in the
menu.
In all Layouts, Channel D can be set to translate MIDI
Clock to CLOCK and RESET.
All Layouts respond to MIDI Pitch Bend messages (range
can be set in the SETTINGS) and some respond to
Velocity and Aftertouch.
The 1983 has 4 CV Inputs which, when used, allow the
module to be used as a creative tonal tool (arpeggiator /
sequencer) rather than just a MIDI Interface. When these
Inputs are unused, the 1983 is just a straight up converter.
The WINDOW jack opens up creative voice allocations,
the UPDATE jack can time-quantize the rendering of the
Outputs to fit on a grid or a trigger pattern, the
TRANSPOSE jack can arpeggiate notes or just simply
transpose, and the PORTAMENTO jack can slow down
the transitions between notes.
In QUANTIZER mode, these 4 CV Inputs (also marked as
QA, QB, QC, QD) can be used as a quantizer CV Inputs
instead: turning the 1983 into a 4 channel performance
quantizer. The quantizer scales can be either defined by
playing MIDI Notes in legato or edited in the LEARN mode.
All the 1983 settings can be stored as a PRESET, and 10
dierent presets can be stored and loaded from the
memory. The 1983’s firmware can be updated by MIDI
SysEx playback.
NOTE: MIDI standard was introduced in 1983 and it
seemed like the future.
1983 Features
■4 channels of CV and GATE
■LISTEN input per channel for automatic tuning
■automatic tuning by a single press of a button
(oset & scaling correction)
■several tuning systems (equal temperament, just
intonation, A = 440/432 Hz etc.)
■LAYOUT selection (4 voice, 3+1 voice, 2 velocity
voice, 4×1 voice, 1 voice, 8 gates, 8 CCs,
4 triggers + velocity, quantizer)
■each layout can map outputs of Channel D to MIDI
Clock (adjustable divider) and Reset
■LEARN mode to assign MIDI channel and other
properties
■UPDATE jack to quantize outputs to clock or trigger
sequences
■WINDOW jack to creatively allocate notes in the
buer to available voices
■TRANSPOSE CV to shift outputs by semitones,
fifths or octaves
■PORTAMENTO CV to adjust glide time
■responds to MIDI Note On & O, CC (also Sustain),
Velocity, Pitch Bend, Clock, Aftertouch
■µTune scale editing per each semitone in octave
Technical details
■7 HP
■PTC fuse and diode protected 10-pin power connector
■24mm deep
■power consumption +12: < 60 mA, -12: <20 mA
MIDI to CV converter
The 1983 module translates MIDI data to analog signals.
There are several ways in which this conversion can
happen, and the 1983 can also modify the way Outputs
behave based on the CV Inputs. Therefore, it is a good
idea to take a look at the general signal flow first.
Signal Flow
CV Outputs
CV Outputs output voltages between -0.4V and 7.2V;
therefore, they are capable of driving 7 octaves using the
One Volt per Octave standard. The Outputs always
automatically calibrate themselves at startup to output
precise voltages and they have 12-bit resolution. Besides
producing precise voltages, the Outputs can be adjusted
to compensate for tuning oset and exponential curve
error for any oscillator by creating a tuning correction
thanks to the frequency measurement of the LISTEN
Inputs. The exact rendering of each output is dependent
on the Layout and Learn settings and can also be aected
by some of the CV Inputs. You can also use the UP and
DOWN buttons to transpose octaves (more on that later).
Gate Outputs
GATE Outputs are capable of producing voltages of either
0V or 5V depending on whether the gate is High or Low.
The exact functioning of each Output depends on the
Layout and Learn settings, and can also be aected by
some of the CV Inputs.
Gate LEDs
GATE LEDs mostly indicate the current state of the GATE
Output. In modes other than the home screen, these LEDs
are also used, together with the display, to communicate
more information.
Listen & Tune & CV
Each Channel has a LISTEN Input to measure the
frequency of the oscillator under control, so the 1983 can
perform its automatic tuning operations.
Connect the output of a simple waveform (triangle, singe,
pulse, saw) of an oscillator to the LISTEN Input. Then
connect the 1983 CV OUT of the same Channel to the Volt
per Octave input on that oscillator. Now the oscillator can
be automatically tuned by hitting the TUNE button.
The easiest way to tune:
Momentarily disconnect the Volt per Octave input of your
oscillator from the CV Output of the 1983 and set it to
produce frequencies in the lower audio range. If your
oscillator has an LED indicating the oscillation, set it at the
border between the LED emitting steady light and starting
to flicker. Connect the CV Out to the V/Oct In again and
press Tune.
NOTE: The oscillator frequency can be set even under
20Hz but not too much lower. If the oscillator is set too low
the calibration will take too long and the tuning procedure
will time-out without completing.
Tune
The TUNE button initiates the tuning algorithm. The 1983
only tunes the oscillators on a user request i.e. by pushing
the TUNE button. There is NO automatic tuning
happening in the background.
Initially, the tuning is done by measuring two tuning points
per every octave and adjusting the CV, so that these points
are as precise as possible. All other semitones are
interpolated between these points. Scanning the
frequency response of an oscillator might take between
1-5 seconds, mostly depending on how much in tune the
oscillator is and how low its base pitch is set (measuring
low frequencies takes more time).
During the initial tuning procedure, “T.” (with a dot) is
displayed and when the oscillator is successfully
calibrated, the corresponding GATE LED will light up.
The second time the tuning algorithm is initiated, it only
tries to compensate for potential drift of the oscillators, so
it will take far less time to complete. It does not change the
current note being played unless the note is higher pitch. If
the frequency is quite high, the 1983 transposes it a few
octaves down to do the measurement to ensure high
precision of measurement. It only checks whether the
frequency is correct, and eventually adjusts the tuning
compensation according to the potential drift. This is very
useful in live performance scenarios.
During the re-tuning procedure, “T” (without a dot) is
displayed and when an oscillator is successfully
calibrated, the corresponding GATE LED will light up.
If full re-calibration is required, hold the TUNE button for
more than 2 seconds to start scanning all octaves.
Octave Selection
Press the UP or DOWN button to transpose the Outputs
one or several octaves up or down. Press both the UP and
DOWN buttons at the same time to reset the octave
selection settings.
Note on tuning precision: This is a very interesting topic,
since the default tuning system we use in western music –
equal temperament – is “out of tune”. It is a compromised
tuning system that allows transposing music into all keys,
but does not keep mathematically correct tuning intervals.
Some acoustic instruments play only mathematical
intervals by their physical definition.
However, most tuners are set to indicate tuning in equal
temperament at 440 Hz. Not all tuners respond in exactly
the same way and some have problems telling the
frequency of certain notes.
The 1983 was calibrated by cross-referencing a KORG
chromatic tuner, the iPhone app IntaTune and the tuner in
Ableton Live and often the readout was dierent on the
individual tuners by a cent or two. Two cents might actually
be an acceptable error for a tuner itself. The 1983 has two
cent precision. The minimal, barely noticeable, dierence
humans can hear is 5-6 cents for trained musicians and a
lot more for untrained musicians (100 cents = semitone).
µTune
The µTune mode allows you to adjust all 12 semitones in
an octave UP or DOWN by fine increments. Custom
tunings can be edited and stored as presets.
NOTE: This is especially useful for setting precise
mathematical ratios between notes – just intonation or
pythagorean tuning (equal temperament is “out of tune” in
this sense). This is useful especially when working with
polyphony and paraphony. Certain tones and their
overtones (harmonics) can become other notes'
overtones and they can create beating eects between the
tones and the overtones.
WARNING: Once you do this, it is really hard to go back to
equal temperament :-))) There is a great tuner app for
iPhone called IntaTune which was also used while
developing this module.
µTune Preset
Hold SET and press TUNE to enter the µTune PRESET
mode. The sign “µ” and the number “0-9” will alternate.
The number represents the µTune PRESET number, and
you can browse the presets using the UP/DOWN buttons.
There are 10 dierent presets in the module, and by default
a few dierent tuning systems are programmed, but they
can all be adjusted.
0-5: the same equal temperament, tuned to A = 440Hz
6: equal temperament, tuned to A = 432Hz
7: just intonation in the key of C
8: just intonation in the key of Bb
9: just intonation in the key of D
All presets can be adjusted and stored.
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